Combined, both units produce 242bhp, with 354lb ft of torque available between 1,500 and 4,200rpm, giving the luxury hybrid a 0-62mph of 7.7sec, with top speed achieved at 146mph.

The aluminium-bodied hybrid will return “in excess” of 44mpg according to Audi, with CO2 emissions of less than 148g/km. A maximum of 1.86 miles is achievable on electric power alone when driven at a constant 37mph.

The A8 hybrid also offers five operating states: with the TFSI engine alone, electric drive only or in hybrid mode; recuperation and boosting are also possible. Two displays show the driver all operating modes in detail.

Externally, the frugal new A8 features 18-inch or optional 19-inch ten-spoke alloys, Arctic Silver paint, hybrid badges and LED headlights. Inside, standard equipment includes three-zone automatic air conditioning and a Bose sound system.

Audi has given no indication on pricing as yet, but a 10 per cent premium over the entry-level car – the £56,295 3.0-litre TFSI quattro SE – should be expected at approximately £62,000.